Ive had goofy noises come from cheap components like lowering hats.
when you turn or go in/out of a driveway the go "pong!" from the spring moving on the hat.
If the spring is rotating on the hat vs. the bearing allowing it to turn will cause this noise.
the rubber isolator is correctly installed?

It was the shocks. KW had some older sets that had low fluid. A small batch that went out to mk6 vw guys and apparently some e82s.